Extension-base lamp-bulb



P. P. HEIN.

EXTENSION BASEy LAMP BULB. APPLICATION FILED NOV.5, 1918.

1,339,333. Patented May 4,1930.-

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PAUL P. HEIN, or NEW YORK, N. Y.

vnxTENsroN-BASE LAMP-BULB.

i Specification of Letters Patent.

Patented May 4, 1920.

Application filed November 5, 1918. Serial No. 261,247.

To all whom t may concern.'

l-e it known that l., PAUL F. HEIN, a citizen of the United States, and aresident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and improved llxtension-Base Lamp-Bulb, of which the following is a full, clear, and exact description.

This invention relates. to electric lamp bulbs, and has particular reference to such lamps that are intended for use in connection with parabolic or other similar reflectors and in connection with whichit is essential or important that the lamp bulbs must be properly focused.

Among the objects of the invention, therefore, is to provide an electric lamp bulb having an adjustable or extensible base whereby when the base is locked in the Vreflector socket the filament or bulb portion proper of the lamp may be adjusted axially toward or from the socket anchorage for focusing purposes.

A :further object of the invention is to provide an electric lamp bulb adapted to be fitted or adjusted for use in connection'with any ordinary reector, the socket of which has a iixed position with respect to the reflector. A

With the foregoingand other objects iny view the invention consists in the varrangement and combination-of parts hereinafter described and claimed, and while the invention is nnot restricted to the exact details of construction disclosed or suggested herein,l still for the4 purpose of illustrating a practical embodiment thereof reference is,

had to the accompanying drawings, lin which like reference characters designate the same parts -in the several views, and in which- Figure 1 is a side elevation ofone form of my improvement, parts being in longitudi.

nal section.

Fig. 2 is a plan view of the same; and Fig. 3 is a view substantially the same'as Fig. 1, but indicating a`slightly modified form of construction.

Referring now more specifically to the 5 drawings, I show a lamp bulb having a base comprising two .relatively movable or eX- tensible inner and outer base members 10 and 11, the one shown as being telescopic in the other and having means for holding the two base parts in any desired relative position of adjustment' along the axis aforesaid. The lamp filament 12 is supported as usual within the globe or bulb 13 and is carried by the inner base member 10, one of the leading-in wires being grounded in the inner base member 10 at any convenient point as at 14, while the other leading-in wire is connected to or constitutes a continuation of a convoluted member or spring 15 leadlng through the plug 16 in the anchorage end of the outer base member 11 and fastened to a metallic tip orbutton 17.

The plug 16 is of porcelain or some other y operating with a longitudinally serratedr portion 22 of .the inner telescopic base memoer 10. The teeth formed at 22 havesloping inner and outer sides over which the catch portion 21 of the tongue 20 is adapted to slip when the bulb and its attached base portion .10 are pushed inward or outward, but the catch serves to hold the bulb steady and reliably in any position in which it.

may be set or adjusted. The outer member l1 has suiiicient frictional grip on the substantially cylindrical surface of the inner member 10 in all positions of adjustment of the lamp bulb, but permitting the longitudinal adjustment thereof in order to bring the filament 12 or source of light into proper focus. This adjustment of the lamp bulb vis provided for in the spring or convoluted member 15 arranged as indicated. The construction in Fig. 3 so :Ear as this present invention is concerned is essentially the same as that above described with reference to the telescopic inner and outer members 10 and 11, but the leadingin wires of the filament 12 are connected to two metallic buttons 17 both of the leading-in wires passing through or connected to convolutedmembers 15 both of which pass throughvthe plug 16. Thejinner and outer base members 10 and 11 for convenience of manufacture and adaptability to standard reflector sockets are preferably cylindrical in form,and in' this connection it will be v inner member aforesaid, said spacing beingl noted that the catch tongue 20 constituting a fixed part of' the hollow cylindrical member or sleeve 11 and projecting into the notched or toothed portion 22 of the inner base member l() constitutes not only a means variable as a result' of the relative movement aforesaid, a convoluted conductor in the space between the plug and the inner member and having one end projecting through the plug, a lamp filament having one leading-in wire connected to said convoluted member, and the other leadin -in wire passing through the inner member rst mentioned.

2. In an electric lamp bulb, the combinai tion of inner and outer telescopic base members, means to lock the outer member in fixed position leaving the inner member freeto be moved inward or outward with respect thereto, one of said base members having a flexible catch member cooperating automatically with the other member to hold the parts at any desired position longitudinally of the axis of the lamp, a bulb xedyto said inner base member, a filament within the bulb having leading-in wires passing through the inner base member, and a convoluted conductor to which one of the leading-in wires is connectedubetween the two relatively movable base members.

3. In an electric lamp, the vcombination of a base comprising a sleeve having longitudinal slits forming a flexible tongue, a

ymember fitted telescopically within the sleeve and/having a series of depressions with which the :free end portion of the tongue is adapted to 'coperate, and a lamp bulb carried by said member having the depressions. l

4. In an extension base for lampbulbs,

the combination of a hollow cylindrical-base member, an inner cylindrical member telescopically fitted in the hollow member, a bulb fixed tothe inner member, and flexible catch means acting between the inner and outer'cylindrical members serving to hold the inner member at any desired longitudinal adjustment and also serving to prevent rotation of the inner member in the hollow member.

- PAUL P. HEIN. 

